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Requests following a rejected SETUP requests failed too, which sometimes
produces user-visible errors and may confuse implementations. (E.g., when probing for an unimplemented feature and subsequently being greeted by a timeout.) - fw/comon/usb.c (handle_setup): set SOPRDY when answering a request error with a stall, according to the example in AN139. This seems to eliminate the timeouts observed in requests following after bad requests. - fw/boot/boot.c (run_payload): described how the host is expected to respond to the device resetting its USB stack
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@ -71,6 +71,15 @@ void run_payload(void)
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/* Restart USB */
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USB0XCN = 0;
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/*
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* The USB host must detect a disconnect (pull-ups absent) within 2 and
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* 2.5 us according to parameter Tddis in table 7-13 on page 186 of the
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* Universal Serial Bus Specification Revision 2.0.
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*
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* If our application calls usb_init really really quickly, we may need
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* an extra delay here.
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*/
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debug("launching payload\n");
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__asm
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@ -1,8 +1,8 @@
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/*
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* common/usb.c - USB hardware setup and standard device requests
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*
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* Written 2008, 2009 by Werner Almesberger
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* Copyright 2008m 2009 Werner Almesberger
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* Written 2008-2010 by Werner Almesberger
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* Copyright 2008-2010 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -258,8 +258,9 @@ okay:
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}
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stall:
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printk("STALL\n");
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usb_write(E0CSR, SDSTL_0);
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ep0.state = EP_STALL;
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/* AN139 recommends this sequence */
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usb_write(E0CSR, SOPRDY | SDSTL_0);
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ep0.state = EP_IDLE;
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}
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